Hello there, Marmoset toolbag is working on viewport with .alembic file and animation, everthing is okey. When i try to export animation viewer, on the Marmoset Viewer is not working. you can see only still frame. (I am using marmoset toolbag trial version.)
Currently Alembic geometry caching is not supported in Marmoset Viewer. If you have a rigged and animated mesh we recommend using FBX if you plan to export to Viewer.
FBX will support the material setup you have in your screenshot above, just make sure to create a unique material for each UDIM and load the textures. If you use the same material names for your FBX file you should be able to import it into that scene and have the materials automatically apply correctly.